import https://github.com/servo/html5ever

commit d1206daa740305f55a5fa159e43eb33afc359cb4

1 files changed, 137 insertions, 0 deletions

diff --git a/src/driver.rs b/src/driver.rs
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--- /dev/null
+++ b/src/driver.rs
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+// Copyright 2014-2017 The html5ever Project Developers. See the
+// COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! High-level interface to the parser.
+
+use crate::buffer_queue::BufferQueue;
+use crate::tokenizer::{Tokenizer, TokenizerOpts, TokenizerResult};
+use crate::tree_builder::{create_element, TreeBuilder, TreeBuilderOpts, TreeSink};
+use crate::{Attribute, QualName};
+
+use std::borrow::Cow;
+
+use crate::tendril;
+use crate::tendril::stream::{TendrilSink, Utf8LossyDecoder};
+use crate::tendril::StrTendril;
+
+/// All-encompassing options struct for the parser.
+#[derive(Clone, Default)]
+pub struct ParseOpts {
+    /// Tokenizer options.
+    pub tokenizer: TokenizerOpts,
+
+    /// Tree builder options.
+    pub tree_builder: TreeBuilderOpts,
+}
+
+/// Parse an HTML document
+///
+/// The returned value implements `tendril::TendrilSink`
+/// so that Unicode input may be provided incrementally,
+/// or all at once with the `one` method.
+///
+/// If your input is bytes, use `Parser::from_utf8`.
+pub fn parse_document<Sink>(sink: Sink, opts: ParseOpts) -> Parser<Sink>
+where
+    Sink: TreeSink,
+{
+    let tb = TreeBuilder::new(sink, opts.tree_builder);
+    let tok = Tokenizer::new(tb, opts.tokenizer);
+    Parser {
+        tokenizer: tok,
+        input_buffer: BufferQueue::new(),
+    }
+}
+
+/// Parse an HTML fragment
+///
+/// The returned value implements `tendril::TendrilSink`
+/// so that Unicode input may be provided incrementally,
+/// or all at once with the `one` method.
+///
+/// If your input is bytes, use `Parser::from_utf8`.
+pub fn parse_fragment<Sink>(
+    mut sink: Sink,
+    opts: ParseOpts,
+    context_name: QualName,
+    context_attrs: Vec<Attribute>,
+) -> Parser<Sink>
+where
+    Sink: TreeSink,
+{
+    let context_elem = create_element(&mut sink, context_name, context_attrs);
+    parse_fragment_for_element(sink, opts, context_elem, None)
+}
+
+/// Like `parse_fragment`, but with an existing context element
+/// and optionally a form element.
+pub fn parse_fragment_for_element<Sink>(
+    sink: Sink,
+    opts: ParseOpts,
+    context_element: Sink::Handle,
+    form_element: Option<Sink::Handle>,
+) -> Parser<Sink>
+where
+    Sink: TreeSink,
+{
+    let tb = TreeBuilder::new_for_fragment(sink, context_element, form_element, opts.tree_builder);
+    let tok_opts = TokenizerOpts {
+        initial_state: Some(tb.tokenizer_state_for_context_elem()),
+        ..opts.tokenizer
+    };
+    let tok = Tokenizer::new(tb, tok_opts);
+    Parser {
+        tokenizer: tok,
+        input_buffer: BufferQueue::new(),
+    }
+}
+
+/// An HTML parser,
+/// ready to receive Unicode input through the `tendril::TendrilSink` trait’s methods.
+pub struct Parser<Sink>
+where
+    Sink: TreeSink,
+{
+    pub tokenizer: Tokenizer<TreeBuilder<Sink::Handle, Sink>>,
+    pub input_buffer: BufferQueue,
+}
+
+impl<Sink: TreeSink> TendrilSink<tendril::fmt::UTF8> for Parser<Sink> {
+    fn process(&mut self, t: StrTendril) {
+        self.input_buffer.push_back(t);
+        // FIXME: Properly support </script> somehow.
+        while let TokenizerResult::Script(_) = self.tokenizer.feed(&mut self.input_buffer) {}
+    }
+
+    // FIXME: Is it too noisy to report every character decoding error?
+    fn error(&mut self, desc: Cow<'static, str>) {
+        self.tokenizer.sink.sink.parse_error(desc)
+    }
+
+    type Output = Sink::Output;
+
+    fn finish(mut self) -> Self::Output {
+        // FIXME: Properly support </script> somehow.
+        while let TokenizerResult::Script(_) = self.tokenizer.feed(&mut self.input_buffer) {}
+        assert!(self.input_buffer.is_empty());
+        self.tokenizer.end();
+        self.tokenizer.sink.sink.finish()
+    }
+}
+
+impl<Sink: TreeSink> Parser<Sink> {
+    /// Wrap this parser into a `TendrilSink` that accepts UTF-8 bytes.
+    ///
+    /// Use this when your input is bytes that are known to be in the UTF-8 encoding.
+    /// Decoding is lossy, like `String::from_utf8_lossy`.
+    #[allow(clippy::wrong_self_convention)]
+    pub fn from_utf8(self) -> Utf8LossyDecoder<Self> {
+        Utf8LossyDecoder::new(self)
+    }
+}